Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins
Hypoxia is common in aquatic environments and has substantial effects on development, metabolism and survival of aquatic organisms. To understand the physiological effects of hypoxia and its dependence on temperature, metabolic rate (ṀO2) and cardiorespiratory function were studied in response to a...
Published in: | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology |
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ftunivtasmania:oai:eprints.utas.edu.au:26794 2023-05-15T15:31:44+02:00 Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins Polymeropoulos, ET Elliott, NG Frappell, PB 2017 https://eprints.utas.edu.au/26794/ https://doi.org/10.1016/j.cbpa.2017.08.011 unknown Elsevier Science Inc Polymeropoulos, ET orcid:0000-0002-4816-6005 , Elliott, NG and Frappell, PB 2017 , 'Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins' , Comparative Biochemistry and Physiology. Part A, vol. 213 , pp. 28-35 , doi:10.1016/j.cbpa.2017.08.011 <http://dx.doi.org/10.1016/j.cbpa.2017.08.011>. salmon physiology Atlantic salmon hypoxia temperature acclimation metabolic compensation Article PeerReviewed 2017 ftunivtasmania https://doi.org/10.1016/j.cbpa.2017.08.011 2021-09-13T22:17:41Z Hypoxia is common in aquatic environments and has substantial effects on development, metabolism and survival of aquatic organisms. To understand the physiological effects of hypoxia and its dependence on temperature, metabolic rate (ṀO2) and cardiorespiratory function were studied in response to acute hypoxia (21 → 5 kPa) at different measurement temperatures (Ta; 4, 8 and 12 °C) in Salmo salar alevins that were incubated under normoxic conditions (PO2 = 21 kPa) or following hypoxic acclimation (PO2 = 10 kPa) as well as two different temperatures (4 °C or 8 °C). Hypoxic acclimation lead to a developmental delay manifested through slower yolk absorption. The general response to acute hypoxia was metabolic depression (~ 60%). Hypoxia acclimated alevins had higher ṀO2s when measured in normoxia than alevins acclimated to normoxia. ṀO2s were elevated to the same degree (~ 30% per 4 °C change) irrespective of Ta. Under severe, acute hypoxia (~ 5 kPa) and irrespective of Ta or acclimation, ṀO2s were similar between most groups. This suggests that despite different acclimation regimes, O2 transport was limited to the same degree. While cardiorespiratory function (heart-, ventilation rate) was unchanged in response to acute hypoxia after normoxic acclimation, hypoxic acclimation led to cardiorespiratory changes predominantly in severe hypoxia, indicating earlier onset and plasticity of cardiorespiratory control mechanisms. Although ṀO2 in normoxia was higher after hypoxic acclimation, at the respective acclimation PO2, ṀO2 was similar in normoxia and hypoxia acclimated alevins. This is indicative of metabolic compensation to an intrinsic ṀO2 at the acclimation condition in hypoxia-acclimated alevins after re-exposure to normoxia. Article in Journal/Newspaper Atlantic salmon Salmo salar University of Tasmania: UTas ePrints Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 213 28 35 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
unknown |
topic |
salmon physiology Atlantic salmon hypoxia temperature acclimation metabolic compensation |
spellingShingle |
salmon physiology Atlantic salmon hypoxia temperature acclimation metabolic compensation Polymeropoulos, ET Elliott, NG Frappell, PB Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins |
topic_facet |
salmon physiology Atlantic salmon hypoxia temperature acclimation metabolic compensation |
description |
Hypoxia is common in aquatic environments and has substantial effects on development, metabolism and survival of aquatic organisms. To understand the physiological effects of hypoxia and its dependence on temperature, metabolic rate (ṀO2) and cardiorespiratory function were studied in response to acute hypoxia (21 → 5 kPa) at different measurement temperatures (Ta; 4, 8 and 12 °C) in Salmo salar alevins that were incubated under normoxic conditions (PO2 = 21 kPa) or following hypoxic acclimation (PO2 = 10 kPa) as well as two different temperatures (4 °C or 8 °C). Hypoxic acclimation lead to a developmental delay manifested through slower yolk absorption. The general response to acute hypoxia was metabolic depression (~ 60%). Hypoxia acclimated alevins had higher ṀO2s when measured in normoxia than alevins acclimated to normoxia. ṀO2s were elevated to the same degree (~ 30% per 4 °C change) irrespective of Ta. Under severe, acute hypoxia (~ 5 kPa) and irrespective of Ta or acclimation, ṀO2s were similar between most groups. This suggests that despite different acclimation regimes, O2 transport was limited to the same degree. While cardiorespiratory function (heart-, ventilation rate) was unchanged in response to acute hypoxia after normoxic acclimation, hypoxic acclimation led to cardiorespiratory changes predominantly in severe hypoxia, indicating earlier onset and plasticity of cardiorespiratory control mechanisms. Although ṀO2 in normoxia was higher after hypoxic acclimation, at the respective acclimation PO2, ṀO2 was similar in normoxia and hypoxia acclimated alevins. This is indicative of metabolic compensation to an intrinsic ṀO2 at the acclimation condition in hypoxia-acclimated alevins after re-exposure to normoxia. |
format |
Article in Journal/Newspaper |
author |
Polymeropoulos, ET Elliott, NG Frappell, PB |
author_facet |
Polymeropoulos, ET Elliott, NG Frappell, PB |
author_sort |
Polymeropoulos, ET |
title |
Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins |
title_short |
Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins |
title_full |
Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins |
title_fullStr |
Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins |
title_full_unstemmed |
Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins |
title_sort |
hypoxic acclimation leads to metabolic compensation after reoxygenation in atlantic salmon yolk-sac alevins |
publisher |
Elsevier Science Inc |
publishDate |
2017 |
url |
https://eprints.utas.edu.au/26794/ https://doi.org/10.1016/j.cbpa.2017.08.011 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
Polymeropoulos, ET orcid:0000-0002-4816-6005 , Elliott, NG and Frappell, PB 2017 , 'Hypoxic acclimation leads to metabolic compensation after reoxygenation in Atlantic salmon yolk-sac alevins' , Comparative Biochemistry and Physiology. Part A, vol. 213 , pp. 28-35 , doi:10.1016/j.cbpa.2017.08.011 <http://dx.doi.org/10.1016/j.cbpa.2017.08.011>. |
op_doi |
https://doi.org/10.1016/j.cbpa.2017.08.011 |
container_title |
Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology |
container_volume |
213 |
container_start_page |
28 |
op_container_end_page |
35 |
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1766362254699134976 |